import React, { Component , useState, useEffect } from 'react'
import * as echarts from 'echarts';

export default class Heatmap extends Component {    
    initChart = () => {
        var chartDom = document.getElementById('HeatmapChart');
        this.myChart = echarts.init(chartDom);
        let noise = getNoiseHelper();
        let xData = [];
        let yData = [];
        noise.seed(Math.random());
        function generateData(theta, min, max) {
        let data = [];
        for (let i = 0; i <= 200; i++) {
            for (let j = 0; j <= 100; j++) {
            data.push([i, j, noise.perlin2(i / 40, j / 20) + 0.5]);
            }
            xData.push(i);
        }
        for (let j = 0; j < 100; j++) {
            yData.push(j);
        }
        return data;
        }
        let data = generateData(2, -5, 5);
        var option = {
        tooltip: {},
        xAxis: {
            type: 'category',
            data: xData
        },
        yAxis: {
            type: 'category',
            data: yData
        },
        visualMap: {
            min: 0,
            max: 1,
            calculable: true,
            realtime: false,
            inRange: {
            color: [
                '#313695',
                '#4575b4',
                '#74add1',
                '#abd9e9',
                '#e0f3f8',
                '#ffffbf',
                '#fee090',
                '#fdae61',
                '#f46d43',
                '#d73027',
                '#a50026'
            ]
            }
        },
        series: [
            {
            name: 'Gaussian',
            type: 'heatmap',
            data: data,
            emphasis: {
                itemStyle: {
                borderColor: '#333',
                borderWidth: 1
                }
            },
            progressive: 1000,
            animation: false
            }
        ]
        };

        function getNoiseHelper() {
        class Grad {
            constructor(x, y, z) {
            this.x = x;
            this.y = y;
            this.z = z;
            }
            dot2(x, y) {
            return this.x * x + this.y * y;
            }
            dot3(x, y, z) {
            return this.x * x + this.y * y + this.z * z;
            }
        }
        const grad3 = [
            new Grad(1, 1, 0),
            new Grad(-1, 1, 0),
            new Grad(1, -1, 0),
            new Grad(-1, -1, 0),
            new Grad(1, 0, 1),
            new Grad(-1, 0, 1),
            new Grad(1, 0, -1),
            new Grad(-1, 0, -1),
            new Grad(0, 1, 1),
            new Grad(0, -1, 1),
            new Grad(0, 1, -1),
            new Grad(0, -1, -1)
        ];
        const p = [
            151, 160, 137, 91, 90, 15, 131, 13, 201, 95, 96, 53, 194, 233, 7, 225, 140,
            36, 103, 30, 69, 142, 8, 99, 37, 240, 21, 10, 23, 190, 6, 148, 247, 120,
            234, 75, 0, 26, 197, 62, 94, 252, 219, 203, 117, 35, 11, 32, 57, 177, 33,
            88, 237, 149, 56, 87, 174, 20, 125, 136, 171, 168, 68, 175, 74, 165, 71,
            134, 139, 48, 27, 166, 77, 146, 158, 231, 83, 111, 229, 122, 60, 211, 133,
            230, 220, 105, 92, 41, 55, 46, 245, 40, 244, 102, 143, 54, 65, 25, 63, 161,
            1, 216, 80, 73, 209, 76, 132, 187, 208, 89, 18, 169, 200, 196, 135, 130,
            116, 188, 159, 86, 164, 100, 109, 198, 173, 186, 3, 64, 52, 217, 226, 250,
            124, 123, 5, 202, 38, 147, 118, 126, 255, 82, 85, 212, 207, 206, 59, 227,
            47, 16, 58, 17, 182, 189, 28, 42, 223, 183, 170, 213, 119, 248, 152, 2, 44,
            154, 163, 70, 221, 153, 101, 155, 167, 43, 172, 9, 129, 22, 39, 253, 19, 98,
            108, 110, 79, 113, 224, 232, 178, 185, 112, 104, 218, 246, 97, 228, 251, 34,
            242, 193, 238, 210, 144, 12, 191, 179, 162, 241, 81, 51, 145, 235, 249, 14,
            239, 107, 49, 192, 214, 31, 181, 199, 106, 157, 184, 84, 204, 176, 115, 121,
            50, 45, 127, 4, 150, 254, 138, 236, 205, 93, 222, 114, 67, 29, 24, 72, 243,
            141, 128, 195, 78, 66, 215, 61, 156, 180
        ];
        // To remove the need for index wrapping, double the permutation table length
        let perm = new Array(512);
        let gradP = new Array(512);
        // This isn't a very good seeding function, but it works ok. It supports 2^16
        // different seed values. Write something better if you need more seeds.
        function seed(seed) {
            if (seed > 0 && seed < 1) {
            // Scale the seed out
            seed *= 65536;
            }
            seed = Math.floor(seed);
            if (seed < 256) {
            seed |= seed << 8;
            }
            for (let i = 0; i < 256; i++) {
            let v;
            if (i & 1) {
                v = p[i] ^ (seed & 255);
            } else {
                v = p[i] ^ ((seed >> 8) & 255);
            }
            perm[i] = perm[i + 256] = v;
            gradP[i] = gradP[i + 256] = grad3[v % 12];
            }
        }
        seed(0);
        // ##### Perlin noise stuff
        function fade(t) {
            return t * t * t * (t * (t * 6 - 15) + 10);
        }
        function lerp(a, b, t) {
            return (1 - t) * a + t * b;
        }
        // 2D Perlin Noise
        function perlin2(x, y) {
            // Find unit grid cell containing point
            let X = Math.floor(x),
            Y = Math.floor(y);
            // Get relative xy coordinates of point within that cell
            x = x - X;
            y = y - Y;
            // Wrap the integer cells at 255 (smaller integer period can be introduced here)
            X = X & 255;
            Y = Y & 255;
            // Calculate noise contributions from each of the four corners
            let n00 = gradP[X + perm[Y]].dot2(x, y);
            let n01 = gradP[X + perm[Y + 1]].dot2(x, y - 1);
            let n10 = gradP[X + 1 + perm[Y]].dot2(x - 1, y);
            let n11 = gradP[X + 1 + perm[Y + 1]].dot2(x - 1, y - 1);
            // Compute the fade curve value for x
            let u = fade(x);
            // Interpolate the four results
            return lerp(lerp(n00, n10, u), lerp(n01, n11, u), fade(y));
        }
        return {
            seed,
            perlin2
        };
        }

        this.myChart.setOption(option);
    }
    chartReseize = () => {
        this.myChart && this.myChart.resize()
    }
    componentDidMount() {
        this.initChart()
    }
    render() {
        return (
            <div className='w100 h100' id='HeatmapChart'></div>
        )
    }
}
